/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.optaplanner.training.election.optional.domain;

import java.io.Serializable;
import java.util.Comparator;

import org.optaplanner.training.election.domain.FederalState;

public class FederalStateDifficultyComparator implements Comparator<FederalState>, Serializable {

    @Override
    public int compare(FederalState a, FederalState b) {
        // Assign states with a higher electoral vote per citizen ratio first.
        // Usually these are smalls states, due to the 3 electoral votes per state minimum.
        // They are higher (= more difficult) so they are assigned first.
        return Comparator
                .comparing((FederalState federalState) -> (double) federalState.getElectoralVotes()
                        / (double) federalState.getMinimumMajorityPopulation())
                .compare(a, b);
    }

}
